code: def test_string_response(self):
      response = self.df.chat("Name the highest streamed artist")
      self.assertTrue(response.find("Drake") != -1)
  
file_path: pandas-ai/integration/test_spotify.py
imports: import os
  import unittest
  from pandasai import SmartDataframe
  from pandasai.llm import OpenAI
label_desc: Use image node_id 4 for calling the TestSpotify obj's underlying member method code with example usage: obj.test_string_response() without return types